[SPRING] 사양을 사용하는 다중 열 검색 관련된 엔티티 내의 스프링 데이터 Jpa?

사양을 사용하는 다중 열 검색 관련된 엔티티 내의 스프링 데이터 Jpa?

이 질문을 취하고 있습니다. 단일 테이블의 날짜, 정수 및 문자열 데이터 형식 필드에서 다중 열 검색을 수행 하시겠습니까? 이 메소드는 Java 8에서 Specification 유형의 결과를 앞으로 보내야합니다.

사실 저는 글로벌 검색의 일부뿐만 아니라 협회 엔티티 내에서 검색하고 싶었습니다. JPA 2 사양 API를 사용할 수 있습니까?

저는 직원 및 부서를 @OneToMany 양방향 관계로 보았습니다.

Employee.java

@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
@Entity
public class Employee implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "EMPLOYEE_ID")
    private Long employeeId;

    @Column(name = "FIRST_NAME")
    private String firstName;

    @Column(name = "LAST_NAME")
    private String lastName;

    @Column(name = "EMAIL_ID")
    private String email;

    @Column(name = "STATUS")
    private String status;

    @Column(name = "BIRTH_DATE")
    private LocalDate birthDate;

    @Column(name = "PROJECT_ASSOCIATION")
    private Integer projectAssociation;

    @Column(name = "GOAL_COUNT")
    private Integer goalCnt;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "DEPT_ID", nullable = false)
    @JsonIgnore
    private Department department;
}

Department.java

@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
@Entity
public class Department implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "DEPT_ID")
    private Long departmentId;

    @Column(name = "DEPT_NAME")
    private String departmentName;

    @Column(name = "DEPT_CODE")
    private String departmentCode;

    @OneToMany(fetch = FetchType.LAZY, mappedBy = "department")
    @JsonIgnore
    private Set<Employee> employees;
}

아래와 같이 데이터를 저장했습니다. MyPaginationApplication.java

@SpringBootApplication
public class MyPaginationApplication implements CommandLineRunner {

    public static void main(String[] args) {
        SpringApplication.run(MyPaginationApplication.class, args);
    }

    @Autowired
    private EmployeeRepository employeeRepository;

    @Autowired
    private DepartmentRepository departmentRepository;

    @Override
    public void run(String... args) throws Exception {
        saveData();
    }

    private void saveData() {

        Department department1 = Department.builder()
                .departmentCode("AD")
                .departmentName("Boot Depart")
                .build();
        departmentRepository.save(department1);

        Employee employee = Employee.builder().firstName("John").lastName("Doe").email("john.doe@gmail.com")
                .birthDate(LocalDate.now())
                .goalCnt(1)
                .projectAssociation(2)
                .department(department1)
                .build();
        Employee employee2 = Employee.builder().firstName("Neha").lastName("Narkhede").email("neha.narkhede@gmail.com")
                .birthDate(LocalDate.now())
                .projectAssociation(4)
                .department(department1)
                .goalCnt(2)
                .build();
        Employee employee3 = Employee.builder().firstName("John").lastName("Kerr").email("john.kerr@gmail.com")
                .birthDate(LocalDate.now())
                .projectAssociation(5)
                .department(department1)
                .goalCnt(4)
                .build();
        employeeRepository.saveAll(Arrays.asList(employee, employee2, employee3));
    }
}

EmployeeController.java

@GetMapping("/employees/{searchValue}")
    public ResponseEntity<List<Employee>> findEmployees(@PathVariable("searchValue") String searchValue) {
        List<Employee> employees = employeeService.searchGlobally(searchValue);
        return new ResponseEntity<>(employees, HttpStatus.OK);
    }

EmployeeSpecification.java

public class EmployeeSpecification {
    public static Specification<Employee> textInAllColumns(Object value) {
        return (root, query, builder) -> builder.or(root.getModel().getDeclaredSingularAttributes().stream()
                .filter(attr -> attr.getJavaType().equals(value.getClass()))
                .map(attr -> map(value, root, builder, attr))
                .toArray(Predicate[]::new));
    }

    private static Object map(Object value, Root<?> root, CriteriaBuilder builder, SingularAttribute<?, ?> a) {
        switch (value.getClass().getSimpleName()) {
            case "String":
                return builder.like(root.get(a.getName()), getString((String) value));
            case "Integer":
                return builder.equal(root.get(a.getName()), value);
            case "LocalDate":
                return builder.equal(root.get(a.getName()), value);//date mapping
            default:
                return null;
        }
    }

    private static String getString(String text) {
        if (!text.contains("%")) {
            text = "%" + text + "%";
        }
        return text;
    }
}

/ employees / {searchValue}를 치면 Department 테이블에서 Employee 테이블과 같은 조인을 사용하고있을 수 있습니다. 그게 가능하니? 그렇다면 어떻게 할 수 있습니까?

또는: 여기에 넣는 것이 좋은 방법일까요? @Query 사용법 참조

@Query("SELECT t FROM Todo t WHERE " +
            "LOWER(t.title) LIKE LOWER(CONCAT('%',:searchTerm, '%')) OR " +
            "LOWER(t.description) LIKE LOWER(CONCAT('%',:searchTerm, '%'))")
    List<Todo> findBySearchTerm(@Param("searchTerm") String searchTerm);

해결법

from https://stackoverflow.com/questions/57167639/multi-column-search-using-specifications-spring-data-jpa-within-associated-entit by cc-by-sa and MIT license